Much mail coming in to domains hosted by spore (including spore itself) has been defeated by the flakey relays.osirusoft.com which seems to have gone completely off the deep end. In an attempt to address this I've commented out the pertinent line (socks.relays.osirusoft.com) from /etc/postfix/main.cf and reloaded postfix. Fingers crossed that this was the correct course of action...
I've added /etc/init.d/listserv to the runlevel file so it'll start if clone is rebooted.
After the latest reboot of clone, the kernal default went back to having ECN enabled which led to the blocking of Gunroom (and perhaps other) mail to certain recipients whose ISP's routers are broken (or at least out of date). I've turned it off again.
clone-root % /sbin/sysctl -w net/ipv4/tcp_ecn=0 net/ipv4/tcp_ecn = 0